From 82e86ae941194e6b6278ff67aad257b018e0684f Mon Sep 17 00:00:00 2001 From: Dirk Behme Date: Tue, 9 Dec 2014 18:11:27 +0900 Subject: [PATCH] serial: imx: unmap scatter gather list in imx_flush_buffer First, reformat the code to exit immediately. This allows us to add more code in more readable format. In case the TX DMA was still running, remove and disable it's resources. Signed-off-by: Dirk Behme Signed-off-by: Greg Kroah-Hartman --- drivers/tty/serial/imx.c | 13 ++++++++++--- 1 file changed, 10 insertions(+), 3 deletions(-) diff --git a/drivers/tty/serial/imx.c b/drivers/tty/serial/imx.c index b4cf24c64a15..952730ab9067 100644 --- a/drivers/tty/serial/imx.c +++ b/drivers/tty/serial/imx.c @@ -1250,10 +1250,17 @@ static void imx_shutdown(struct uart_port *port) static void imx_flush_buffer(struct uart_port *port) { struct imx_port *sport = (struct imx_port *)port; + struct scatterlist *sgl = &sport->tx_sgl[0]; - if (sport->dma_is_enabled) { - sport->tx_bytes = 0; - dmaengine_terminate_all(sport->dma_chan_tx); + if (!sport->dma_chan_tx) + return; + + sport->tx_bytes = 0; + dmaengine_terminate_all(sport->dma_chan_tx); + if (sport->dma_is_txing) { + dma_unmap_sg(sport->port.dev, sgl, sport->dma_tx_nents, + DMA_TO_DEVICE); + sport->dma_is_txing = false; } } -- 2.20.1